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PR1358019 - Traffic might be blocked on MX with MS-MPC/MS-MIC



Article ID: TSB17692 TECHNICAL_BULLETINS Last Updated: 24 Jan 2020Version: 3.0
Alert Type:
PSN - Product Support Notification
Product Affected:
MX with MS-MPC or MS-MIC
Alert Description:

PR1358019 - On MX Series platforms with MS-MPC or MS-MIC, if a large sum of similar packets (for example, thousands of packets) are received, because of the flaw in the method to process these packets, data/management path was completely blocked and deadlocked. Eventually, traffic might be blocked.

When the MS-MPC/MS-PIC is in this state, you will see similar syslog messages:

May  1 12:05:04  MSRouter-RE0 fpc1 Transient flow-control asserted by MAC on ms-1/0 for 4 seconds
... <multiple times once per second> ...
May  1 12:05:07  MSRouter-RE0 fpc1 Transient flow-control asserted by MAC on ms-1/0 for 4 seconds
May  1 12:05:08  MSRouter-RE0 fpc1 Prolonged flow-control asserted by MAC on ms-1/0, bringing interface down 
May  1 12:05:08  MSRouter-RE0 fpc1 ms-1/0: MAC stuck, trigger coredump via nmi
The cause is a software defect appears in Junos software version 15.1. The software defect has been corrected and integrated in the following Junos software versions:
  • junos:16.1R7-S5
  • junos:16.2R3
  • junos:17.2R2-S7
  • junos:17.3R3-S5
  • junos:17.4R2-S4
  • junos:17.4R3
  • junos:18.2R2-S3
  • junos:18.2R3
  • junos:18.3R3
  • junos:18.4R1-S5
  • junos:18.4R2
  • junos:19.1R1-S2
  • junos:19.1R2
  • junos:19.2R1
  • junos:19.3R1 or later
Additional fixes may be integrated at the later time, please check PR1358019 for the most current information.
The software defect has been corrected. Juniper Networks recommended customers using MS-MPC and MS-MIC to upgrade to Junos software with the fix.
Please contact JTAC if you have any questions about this issue - PR1358019
Modification History:
First publication 2019-12-26

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